磷酸铁锂
电化学
锂(药物)
扩散
阴极
热扩散率
涂层
离子
电导率
无机化学
材料科学
氧化物
化学
分析化学(期刊)
化学工程
冶金
纳米技术
电极
物理化学
热力学
色谱法
有机化学
内分泌学
工程类
医学
物理
作者
Liping Tong,Zhanggui Hu,Long Zhang,Minghua Tang,Xiaoqing Qiu
标识
DOI:10.1016/j.jallcom.2023.169581
摘要
LiFePO4 cathode material has sluggish Li-ion diffusivity, which largely depends on surface modification to accelerate its slow kinetic process. Metal oxides, such as Al2O3, are promising coating materials to improve the capacity retention of the cathode materials in lithium-ion batteries, but their improvement on the diffusion rate of Li-ion is limited. In order to obtain the lithium iron phosphate cathode material with excellent rate and cyclic stability, this paper uses the advantages of La2O3 which has both good stability and low lithium ion diffusion barrier to prepare LiFePO4/[email protected]2O3 by a simple and easy operation method. The cathode of LiFePO4/[email protected]2O3 shows high lithium ion diffusivity of 1.4982 × 10−13 and decreased interface impedance by calculating the Li+ diffusion coefficient and measuring conductivity. Furthermore, the LiFePO4/[email protected]2O3 exhibits excellent rate capacibility (126 mAh g−1 at 10 C within 2.4–4.2 V) and long-cycle stability (96.5% capacity retention at 1 C after 500 cycles). These results indicate that further research on these oxide coating materials can enlarge the applicability of these materials.
科研通智能强力驱动
Strongly Powered by AbleSci AI